Getting your WordPress site a mobile browser is not just a great idea but a necessity because nowadays, people have their own mobile phones that are capable of browsing the web. Any website that doesn’t have a mobile version of their site will be left behind. You will miss a lot of traffic coming from mobile phones because it is hard to read in a mobile phone. If you think its hard, its not. Just direct your website to a mobile traffic subdomain, but if you can’t do that you can do it better in WordPress using the WordPress Mobile Pack.
This is why WordPress mobile themes gain more advantage than subdomains: http://wphacks.com/3-reasons-mobile-wordpress-themes-trounce-mobile-subdomains/